With my first daughter I started opk and only used a total of 7 before I got a peak and ovulated, and I conceived her that month. I am now working past an ectopic pregnancy and we are trying again. For this time(if we end up having another child), I have journaled 65 test strips in the last 3 months. I haven't even been ovulating until days 18 and 19. That also doesn't count all the negative pregnancy tests and the opks I got frustrated with and threw away. I never imagined trying to have a baby would be so frustrating.